Electricity: motive power systems – Motor-reversing – Automatic and/or with time-delay means
Patent
1998-08-28
1999-11-30
Sircus, Brian
Electricity: motive power systems
Motor-reversing
Automatic and/or with time-delay means
318286, 318476, G05B 500
Patent
active
059948582
ABSTRACT:
An obstruction detecting method for use with a power window device comprising a motor activated to open and close a window by means of a window drive mechanism, a motor drive unit for driving the motor, a pulse generator for generating pulses corresponding to revolutions of the motor, a micro-control unit for providing overall drive control, and an operation switch operated manually to instruct the opening and closing of the window. The method comprises the steps of causing the micro-control unit to detect parameter values representing loads applied onto the window when the window is opened or closed; to compare the detected parameter values with a predetermined reference median; to detect an obstruction to the window movement when any detected parameter value is judged to have deviated by at least a predetermined amount from the reference median; and to stop or reverse the motor by means of the motor drive unit on detecting the obstruction. An entire movable range of the window is divided into a plurality of moving areas, each divided moving area being set with the reference median established beforehand as a mean value of the parameter values representing the loads applied onto the window during the window movement throughout each divided moving area with no obstruction occurring thereto.
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Alps Electric Co. ,Ltd.
Sircus Brian
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